US1139261A - Thread-guard for sewing-machines. - Google Patents

Description

J. W. DARLEY, JR.

THREAD GUARD FOR SEWING MACHINES.

APPLICATION FILED APR. 6 1910.

SHEET 1,

2 SHEETS Patente Ma w vtmeoaeo I J. w. DARLEY, JR- THREAD-GUARD FOR SEWING MACHINES. APPLICATION FILED APR.6. 1910.

1,139,261 Patented May 11, I915.

2 SHEETS-SHEET 2.

JOHN W. DARLEY, JR., 0F BALTIMORE, MARYLAND.

THREAD-GUARD FOR SEWING-MACHINES.

To all whom it may concern Be it known that I, JOHN W. DARLEY, Jr., a citizen of the United States, residing at Baltimore, in'the State of Mar *land, have invented certain new and useful Improvements in Thread-Guards for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in thread guards for sewing machines, and is especially designed for sewing machines other? used for attaching buttons to garments, but it IS not restricted to thls class of sewing machines, as 1t is capable of general applica- In ordinary sewing machines, occasionally the loop formed in the needle thread-is not properly caught by the shuttle. After the needle goes throughthe goods and commences to return, a loop is formed on the side of the needle adjacent to the shuttle, which is intended to be caught by the hook on the shuttle and drawn over the shuttle. In order to provide thread for this operation, the take-up at the same time moves toward the shuttle. If, as occasionally happens, the hook on the shuttle fails to .catch the loop, the looseness'of the thread, which is nor mally provided so that thethread may be freely carried around by the shuttle, is not compensated for and the thread hangs loose in the air. This 15 apt to cause tanghng and breaking of the thread as the take-up moves back. In the case of button sewing machines, on the first stitch the needle thread is carried through the fabric and is held by holding means, and it is only on the second stitch that the needle thread is carried completely around the shuttle. The take-up device, however, moves toward the shuttle during the first stitch as well as during the stitches, leaving a looseness in the thread during the first stitch, which, as before explained, is liable to cause tangling and breaking as the take-up moves back. By my'invention, however, all these difliculties, incident either to button sewing machines or theordinarysewing machines, are

removed.

With the objects stated in view, my inven tion consists in the construction ant combinations ct parts as hereinafter described and claimed.

Specification of Letters Patent.

Patented May 11, 1915.

Application filed April 6, 1910. Serial N 0. 553,772.

In the accompanying drawings-Figure 1 represents a button sewing machine inside elevation, parts being omit-ted. Fig. 2 is a front view of the same, on a larger scale, showing my invention applied to the end of the machine. Fig. 3 is a perspective view of the thread guard, shown detached.

1 represents a sewing machine of a stand ard type with my improved thread guard applied thereto. It is provided with the usual mechanism for operating the needle, shifting the work and the button, and operating the shuttle, which parts need not be specifically described. It is also provided with the usual starting, stopping, and operation governing dev1ces.as set forth in my application, Serial No. 570,857filed July I 7, 1910, which require no specific description here. In the machine shown in the drawing, however, a bell crank lever 2, adapted to be operated by a wire 3, attached to'a pedal in the ordinary manner, is shown, for the purpose of starting the machine.

4 represents the front end of the machine, provided with the usual guides, in which the needle 5 is reciprocated, and also provided with a standard tension device-.6 and a standard take-.up 7. To the front end of the part 4 is attachedthe thread guard, which consists of a funnel-shaped portion 8, having a flat rear part 9, and tapering downwardly to a small perforated end 10. The rear part 9 is slotted, as shown at 11,

'tion of the take-up and preventing the loose thread from flying up over the end of the take-up.

being spaced apart to provide-for the mo- Around the lower end of the part 8 is arranged a wire guide 13, through which the thread passes. In the side of the part 8 is secured a hardened steel plate 14, provided with a central perforation, through which the thread is passed. The hole in this small plate 14- is so arranged that the thread, after being passed over the tension, device, will pass in practically a straight line'to the hole in the take-up lever, when the latter is in its highest position.

The rearportion S) has an extension 15, which is arranged substantially parallel to the portion 9, and is provided withperiterations in which are located screws 16,

which fasten the whole thread guard to the front of the machine. This extension has aforwardly extending curved rib 17 on one edge. The curved part 8 is made integral with the part 9 on the line 18, but does not closely fit this part on the other edge, for, as shown at 19, there is a space left to permit the passage of the thread during the threading operation. The curved side 17 is to part 15 tapersdownwardly to its lower end ,the wire. .spring' plate 23 shuttle and of sewin and is provided with a smaller curved side 22, 7 making a trough through which the thread passes.

of the thread from working backward and getting entangled in the needle bar and contiguous parts.

The thread, after passing downwardly beyond the thread guard, is passed behind the spring portion 23, of standard construction, by the needle bar, and then down through the hole in the end of the needle.

The button is supported in a button holder of any approved construction, which is not shown in the drawing. The fabric is held between the plates 24: and 25, which with the button chuck are vibrated by the cam 26 in the usual manner, so that the needle will pass through the holes of the button at the proper time. The shuttle is supported below the plate 25 in the usual manner, and operatesin the usualway.

The operation of'threading is as follows: The thread from-the spool is passed through the hole 39, themdown and around the tension device 6, then through the hole in the plate 14, upjthrough the hole in the end of the take-upgl'device 7. It is then passed through the opening 19 and is drawn down and around the lower portion of the wire 13, and passed upwardly andslipped between the free end, of said wire and the side of the I part-"8, and drawn down again, whereupon itypasses through the circular portion 20 of It is then slipped behind the and downwardly through the hole in the point of the needle. This spring plate 23 is adapted to grip the thread and release it at the proper times, this operation being accomplished bywell known means. The operations of threading the on a button have nothing to do with t 's articular invention, and need not be specifically described,

This prevents the looseness at rest, at the beginning of the operation, the parts .are in the position shown in Figs.

1 and 2. The operator, after introducing the fabric and the button into the machine in the well known manner, places his foot' upon the treadle, which pulls down the wire 3 and starts the machine, which is operated by power, into operation. The needle starts downward, carrying the thread, and reaches its lowest position. The needle then starts to rise, forming a loop in the needle thread in the well known manner, and the point of the shuttle hook enters this loop in the well known manner, and the further movement of the shuttle pulls down the free end 10 of the needle thread through the 'hole in the throat plate. During this downward movement, the spring plate 23, which is operated thread, so that the thread cannot be pulled through the hole in the end of the needle toward the shuttle, thus causing the shuttle to pull the end 410 of the thread down through the hole. The needle then continues to rise, the end 40 of the thread being still passed down through the hole, and the take-up device, having moved downwardly, causes a looseness in the thread,

which, by the means already described, is

sewing operation, as hereinafter explained.

1. In a sewing machine, the combination of the frame of the machine, a tension device carried thereby, a take-up device, a needle, means for operating said take-up device and needle, and a thread ard attached to one end of the frame, an through which the needle thread is adapted to pass, including a funnel-shaped portion having a hole in one side, and parts between which said take-up device reciprocates, substantially as described.

2. In a sewing machine, the combination with the machine frame, a needle, a take-up device and means for operating them, of a thread guard secured to one end of the frameand provided with a slot therein,

through which said take-up device recipro- 'bv welllmown means, clamps the needle needle threadmay be proximately funnel-shaped form, substan tially as described.

3. In a sewing machine, the combination with the frame of the machine, a take-up device, a needle and means for operating them, with a thread guard of sheet metal secured to said frame, said. guard being in the main funnel-shaped, with a lower open end, and provided with a hole through which the thread enters, with a slot having guard plates in proximity thereto, through which ames of this patent may be obtained for five cents each, by addressing; the fiommieefioner oi? slot the takeup devise Worhe, with a, space through which the thread mny he slipped,

and a wire guide etteehed to aid guard,

substantially as described. y

In testimony whereof, my signw ture, in presence of two witnesses. V H

JOHN

Witnesses:

H. T. MoKm /ER,

Weshington, D. G.

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